21840728

素因数分解:

$2^3\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{1579}}^1$

素因数の和:1624

約数の個数: 64

約数和(自身を含む): 53088000

約数和(自身を除く): 31247272

約数列:

[1, 2, 4, 7, 8, 13, 14, 19, 26, 28, 38, 52, 56, 76, 91, 104, 133, 152, 182, 247, 266, 364, 494, 532, 728, 988, 1064, 1579, 1729, 1976, 3158, 3458, 6316, 6916, 11053, 12632, 13832, 20527, 22106, 30001, 41054, 44212, 60002, 82108, 88424, 120004, 143689, 164216, 210007, 240008, 287378, 390013, 420014, 574756, 780026, 840028, 1149512, 1560052, 1680056, 2730091, 3120104, 5460182, 10920364, 21840728]

約数ペア:

[(1, 21840728), (2, 10920364), (4, 5460182), (7, 3120104), (8, 2730091), (13, 1680056), (14, 1560052), (19, 1149512), (26, 840028), (28, 780026), (38, 574756), (52, 420014), (56, 390013), (76, 287378), (91, 240008), (104, 210007), (133, 164216), (152, 143689), (182, 120004), (247, 88424), (266, 82108), (364, 60002), (494, 44212), (532, 41054), (728, 30001), (988, 22106), (1064, 20527), (1579, 13832), (1729, 12632), (1976, 11053), (3158, 6916), (3458, 6316)]